FR2781637A1 - Phase modulation filter sound reproduction using parallel components self fed oscillator. - Google Patents

Abstract

The sound reproduction system alters the sound oscillator output using pulses of electrical micro-phase. Phase modulation is carried out using components in parallel (1-3) making a self-fed oscillator driven by an input signal (4).

Description

1 ELECTRIC SIGNAL PROCESSING FOR TRANSDUCER

ELECTRO ACOUSTIC

  It is usual to use electric current filters for electro-acoustic transducers. These filters are generally frequency attenuators with a correction slope of 6 dB, 12

  dB, 18 dB. Mixing consoles use these more or less sophisticated filters to modify the audio bandwidth frequencies. On the other hand, it is customary to have the most perfect possible electrical signal curves, that is to say to obtain the most perfect square signal type responses possible.

  It is noted by the technologies currently used that the electrical audio signals have an excellent quality in impulse response and in frequency regulation. As far as the electro-acoustic transducers are concerned, the transformation of the electrical signal is poorly executed by the transducer (s). Indeed, the electrical pulses go at the speed of the electrons while the membrane and its motor constitute an electro-mechanical unit of a given weight. The weight of this mobile assembly has a mechanical inertia preventing it from responding instantly to the electrical stresses of the audio signal, thus creating distortions or even absence of sound, the membrane being unable to respond simultaneously to all the electrical values. The present method makes it possible to modify the original electrical pulse in at least one modulation, pulses, of electrical micro phase shifts shifting the instantaneous electrical pulse into delayed electrical micro-pulses. Thus, the driving force for starting the movement on the membrane is distributed in a very short space of time so as not to saturate the coil, the motor of the moving mechanical assembly, with current, which can thus absorb, once the factor of acceleration acquired, the rest of the current

  of the original impulse. These micro-currents are generated by the impedances which, crossed by the original electrical signal, generate electrical oscillations by their counterelectromotive forces.

  The components are mounted in parallel on at least two levels.

  The components, mounted on three parallel levels respond better as an electrical phase shift for the electrical absorption of the transducers. The process is therefore the establishment of a self-powered oscillator, activated by the original audio signal passing through the constituent components, to obtain an oscillated signal, of very low amplitude, of very high frequency oscillations (Figl This new signal (2) keeps the general appearance of the original signal (1) which is continuously modulated. This method of parallel mounting of components of the same kind but of different values thus allows a modification of the audio, digital / power signal of electro-acoustic transducers, of at least one acoustic transducer or of an acoustic enclosure. Indeed, this process is placed between an amplifier and an acoustic enclosure or a transducer,

on the power line.

  This process creates micro noise on the original electrical signal which does not change the general curve of the signal but which gives an apparently parasitic appearance of the original signal. The components of this process can be of the nature of passive, active electrical components, microprocessors, integrated circuits or

technology of the future.

  This process is represented by (Fig. 1) whose curve 1 of electrical audio signal is modified in curve 2 according to the present process

  which changes the perfectly smooth signal into at least one wavy signal.

  The present method also has an apparatus made up (Fig. 2) of several electrical components, in this case of coiled resistors, mounted in parallel. The first channel (1) consists of at least one component, the second parallel channel (2) consists of at least one electrical component, in this case consists of two components connected in series. The third channel (3) is also produced by at least one electrical component,

  in this case is constituted by two components in series.

  The assembly thus formed is an interface module, excited by the original electrical signal, mounted between the amplifier (4) and the acoustic enclosure (5). The supply wire (6) of the + receiving the interface module of the present process. This nonlimiting example is carried out by a person skilled in the art. This device made up of components of the same kind with different values, is mounted on any power supply of acoustic enclosure or of at least one

electro-acoustic transducer.

  This process (fig 3) is another variant of the process consisting on the track (1) of at least one electrical component, on the track (2) of at least one electrical component, in this case being two resistors (4, 6) different windings, respectively 3.3 Ohms and 8.2

  Ohms. Track (3) consists of a self (5) of 18 turns.

  All of the components in parallel are mounted on the power supply of at least one electroacoustic transducer (8) of a television, linked to its audio generator (7). The play of the values of the components is such that the original audio signal, analog or digital is not altered as a whole by an attenuation of frequencies but undergoes microoscillations appearing to be like a small regular interference due to the electrical phase shift caused by the components, which intervene directly by their

  nature on the current of the electrical signal supply.

  This module is an interface device between, an analog or digital audio signal, and an electroacoustic transducer so that it can more easily absorb the electrical impulses to be transformed into mechanical movement. (f '; .- 3) It should be noted that the module must never constitute a filter in

  attenuation frequencies of 6 dB or more.

  The aim of the present method and apparatus is to improve the conditions of comfort of electro-acoustic reproduction and the quality of acoustic reproduction usable throughout the world of

  audio, audio and audiovisual reproduction.

Claims (5)

  1- Method in the field of sound reproduction consisting of an oscillator placed on the electrical signal supply, analog or digital, of at least one electro-acoustic transducer, oscillator which modifies the original electrical signal by at least one oscillating electrical signal of very low amplitude and large frequencies not modifying the general appearance of the original signal10, self-powered oscillator powered by the original signal, which passing through the oscillator modifies the original electrical pulse by at least an electrical micro-phase shift pulse.  2- Apparatus for sound reproduction in digital or analog, consisting of at least one electrical component per channel on at least two parallel channels, consisting of passive components of the same kind mounted on any electrical supply of at least an electro-acoustic transducer, or acoustic enclosure, thus constituting an oscillator creating at   minus an electrical micro-phase shift modulation of the original electrical pulse.   3- Apparatus according to claim 2 characterized by electrical components of different values.   4- Apparatus according to claims 2 and 3 characterized by embodiments in active components   5- Apparatus according to claims 2 and 3 characterized by embodiments in microprocessors.